package com.TT.ticket.add;


import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

/**
 * 信号量
 */
public class SemaphoreDemo {

    public static void main(String[] args) throws InterruptedException {

        //线程数量，停车位  //限流
        Semaphore semaphore = new Semaphore(3);

        //6辆车
        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                try {
                    semaphore.acquire();  //得到
                    System.out.println(Thread.currentThread().getName() + "抢到车位");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName() + "离开车位");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    semaphore.release(); //释放
                }
            }, String.valueOf(i)).start();
        }

    }

}
